How to Uninstall Anti-Theft with a Toshiba Laptop

I purchased a Toshiba laptop and I need to uninstall Anti Theft so that I can install my own virus protection.  When I go to uninstall it it prompts me for a email/password.  When I put in the one I created I get that the username/password is incorrect.  I can use this same username/password to launch the product but can't use it to unistall the product?

 

Need help. I have suspected Malware on my PC and need to have antivirus installed ASAP!